#include <stdio.h>

int main(void) {
	unsigned long a,b,c, n, m;
	fscanf(stdin, "%ld", &a);
	fscanf(stdin, "%ld", &b);
	fscanf(stdin, "%ld", &c);
	
	for(n = 1; (b * n) < a; n++);
	for(m = 1; (c * m) < a; m++);
	if((n * 2 / 3) >= m)
		printf("YES\n");
	else
		printf("NO\n");
	
	return 0;
}